Anyone seen my missing 200 revs

[nonitoo]

After a period of 4 weeks where it was not used I find I have lost 200 revs off the top end. I had the boat lifted and pressure washed but this has not made any difference (she was pretty clean anyway). All the temps and pressures are OK and nothing looks amiss in the engine space.

Normal max revs 3800 (now 3600), 2.8ltr Cummins Mercruiser Diesel with Bravo three drive.

Any ideas ?

Thanks

Tom

[Petrolia]

Check the fuel filters.

Happened to me once.

[Fire99]

its probably hiding with my missing 600 rpm (down to 3800rpm from 4400rpm)

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[nonitoo]

I'll check the fuel filters.

[nonitoo]

I'll see if your missing revs are hiding in my fuel filters !!!